The Mountain Hardwear Men's Stretch Ozonic Jacket is a wet-weather backpacking shell with amazing four-way, all-over stretch. The Stretch Ozonic is a lightweight, high-performance 2.5-layer shell that excels on rugged trails in difficult, wet conditions. It boasts Dry.Q Active technology, which banishes moisture, and is made with a fantastic stretch fabric that will move with you when you need it most.